A'//,' \VI1.I.IA.M .S//-.I/A.V.S, F.R.S. 



375 



which ^ ivpivsriitc'd in Plates 31, 32, were placed on board the 

 M-ship " Faraday." They were suspended in a closet adjoining 

 tin- electrician's room, near the centre of motion of the vessel, 

 jind \vfiv (ilserved carefully in Victoria Docks before starting, con- 

 tinuously during the voyage, and on the return of the vessel from 

 Scotia, where it had been sent for the purpose of re-imiting 

 tin: Direct United States Submarine Cable, which hid been frac- 

 tured, where it crossed the Newfoundland Bank, by the dragging 

 of an anchor. The observations during this first trial of the 

 instrument were made by Dr. Higgs, the chief of the electrical staff 

 accompanying the expedition. The following Table gives the 

 results of these observations : 



TAHLK I. 

 BATHOMETER RECORD : STEAMSHIP " FARADAY," OCTOBER, 1875. 



In this Table no correction for latitude has been made ; and 

 although the differences of latitude are not very great, they would 

 nevertheless be more than sufficient to swamp the results of such 

 minute differences of depth as are met with, for instance, in passing 

 from the Thames down through the Channel. The concordant 

 results shown in the Table seem to prove either that the correction 

 for latitude is (for some reason, which, as already stated, I am not 

 able to explain) much less in this instrument than it would be in 

 the case of pendulum indications, or that the reading of the in- 

 strument had not been taken with a proper degree of care. It 

 might be assumed that the known depths of the channel might 

 have betrayed the observer involuntarily into a mistake when 

 observing only small divisions on the instrument, although I must 

 personally dissent from such a supposition, because I entertain the 



